Agustin (@lu2hes) profile picture

Agustin

@lu2hes

Electronics, DSP, Ham Radio, DIY, Linux, 3D printing

 Argentina
Joined July 2016
  • Tweets359
  • Following283
  • Followers159
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Photo by Agustin (@lu2hes)Photo by Agustin (@lu2hes)Photo by Agustin (@lu2hes)Photo by Agustin (@lu2hes)Photo by Agustin (@lu2hes)Photo by Agustin (@lu2hes)Photo by Agustin (@lu2hes)Photo by Agustin (@lu2hes)Photo by Agustin (@lu2hes)Photo by Agustin (@lu2hes)
Sending and receiving mail using winlink and my ubitx on 20m band. I am connected to a node located in Chile almost 900km away, no internet connection needed!
Image from Agustin (@lu2hes)
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Tested SDR++ in my Android tablet using airspy HF discovery. Really impressed! It runs very stable and smooth, the pen is useful to fine tune things in the interface.
Image from Agustin (@lu2hes)
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Great work @ryzerth !
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CW filter and lock detector working
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The expansion board (cw filter, automatic volume control and cw lock detector) is finally mounted in the ubitx. I designed and 3d printed the mount for the cabinet. nitter.gq/lu2hes/status/15766894…
Image from Agustin (@lu2hes)
Image from Agustin (@lu2hes)
Image from Agustin (@lu2hes)
Agustin (@lu2hes) profile pictureAgustin@lu2hes2 Oct 2022
Expansion board for ubitx ready, includes CW filter, PLL to indicate received signal is in band, and automatic volume control (using a LED and a photo resistor in parallel with the volume knob)
Image from Agustin (@lu2hes)
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I also printed some labels for the front panel but I'm not entirely convinced
Image from Agustin (@lu2hes)
Image from Agustin (@lu2hes)
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Finally I have time to integrate the expansion board into the ubitx, I started adding two switches and a LED to the front panel nitter.gq/lu2hes/status/15766894…
Image from Agustin (@lu2hes)
Image from Agustin (@lu2hes)
Agustin (@lu2hes) profile pictureAgustin@lu2hes2 Oct 2022
Expansion board for ubitx ready, includes CW filter, PLL to indicate received signal is in band, and automatic volume control (using a LED and a photo resistor in parallel with the volume knob)
Image from Agustin (@lu2hes)
First steps using JS8call on 10m, not a lot of activity but enough to get familiar with the protocol
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Expansion board for ubitx ready, includes CW filter, PLL to indicate received signal is in band, and automatic volume control (using a LED and a photo resistor in parallel with the volume knob)
Image from Agustin (@lu2hes)
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Next step is the integration into the transceiver, adding some switches to the front panel to enable/disable filter and AVC.
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The work to improve ubitx CW capabilities continues, adding a PLL using LM567 to indicate if the received signal is within the filter's passband.
Image from Agustin (@lu2hes)
Image from Agustin (@lu2hes)
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CW filter for uBitx, based on hi-per-mite (four, two-pole, Sallen-Key op-amp filters)
Image from Agustin (@lu2hes)
Image from Agustin (@lu2hes)
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The frequency response is centered around 650Hz with about 250Hz of BW.
Image from Agustin (@lu2hes)
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SSTV transmission from International Space Station (ISS) received 5 minutes ago
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More images from ISS
Image from Agustin (@lu2hes)
Image from Agustin (@lu2hes)
Image from Agustin (@lu2hes)
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Agustin retweeted
facu_r4 (@facu_r4) profile picture
facu_r4@facu_r43 Nov 2021
Antena dipolo banda 40 metros! Lista para probar!
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Contacts made with new dipole antenna on 15m band using 7W and FT8 over the weekend. Almost 20 different countries!
Image from Agustin (@lu2hes)
Image from Agustin (@lu2hes)
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Very good results despite solar activity was very poor this weekend. This is the dipole center I used: nitter.gq/lu2hes/status/14494560…
Agustin (@lu2hes) profile pictureAgustin@lu2hes16 Oct 2021
Dipole center with balun, 3d model from thingiverse using an FT140-43 ferrite core.
Image from Agustin (@lu2hes)
Image from Agustin (@lu2hes)
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